Fix signup error handling and improve dialog for existing email

[hiraljj05]

Fixes #508

Describe the changes you have made in this PR -

• Fixed the signup button so it responds correctly when clicked.
• Added proper dialogs for signup success and error messages instead of using snackbars.
• Handled the case when an email is already registered with a clear error dialog.
• Prevented LateInitializationError from GetX snackbars by removing snackbar usage.
• Dismisses keyboard automatically on form submission.
• Maintains form state properly; resets only for errors other than “email already exists.”

Screenshots of the changes (If any) -

Note: Please check Allow edits from maintainers. if you would like us to assist in the PR.

Summary by CodeRabbit

• Chores
  • Updated Git configuration to exclude additional sensitive files from version control.

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[coderabbitai]

Walkthrough

This pull request modifies the .gitignore configuration file to adjust Android-related ignore patterns. The change reformats the /android/app/release entry and adds android/app/google-services.json to the list of ignored files. The google-services.json file is a Firebase/Google Cloud configuration file that typically contains sensitive credentials and should not be committed to version control. Net result is two lines added and one removed.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The .gitignore changes (adding android/app/google-services.json) appear unrelated to the signup error handling objectives in issue #508.	Remove the .gitignore changes or move them to a separate pull request focused on configuration/build changes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title mentions fixing signup error handling and improving dialog for existing email, which aligns with the main objective of issue #508 to display error messages for duplicate emails.
Linked Issues check	✅ Passed	The PR addresses issue #508 by implementing clear error dialogs for existing emails, proper form state management, and replacing snackbars with dialogs for better user feedback.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[coderabbitai]

🧹 Nitpick comments (1)

.gitignore (1)

46-46: Use a root-anchored path for consistency.

Other Android entries here are root-anchored (/android/...), so consider aligning this one too.

Suggested diff

-android/app/google-services.json
+/android/app/google-services.json

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ℹ️ Review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between f621531 and b78c571.

📒 Files selected for processing (1)

• .gitignore